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1、文章編號(hào):爆破開(kāi)挖中巷道圍巖缺陷擴(kuò)展的動(dòng)焦散模型實(shí)驗(yàn)研究郭東明收稿時(shí)間:2013-09-28基金項(xiàng)目:國(guó)家自然基金面上項(xiàng)目(51274204);教育部新世紀(jì)優(yōu)秀人才支持計(jì)劃(NCET-12-0965)。作者簡(jiǎn)介:郭東明(1974~),男,江西新余人,副教授,碩士生導(dǎo)師,主要從事礦井建設(shè)方面教學(xué)和研究。E-mail:dmguocumtb@126.comTel:15652938237,2,閆鵬洋1,楊仁樹(shù)1,2,左建平1,袁保森1,趙偉1(1.中國(guó)礦業(yè)大學(xué)(北京)力學(xué)與建筑工程學(xué)院,北京100083;2
2、.深部巖土力學(xué)與地下工程國(guó)家重點(diǎn)實(shí)驗(yàn)室,北京100083)摘要:為了分析爆炸動(dòng)荷載對(duì)巷道圍巖不同位置處缺陷的擾動(dòng)影響,采用爆炸加載透射式動(dòng)焦散實(shí)驗(yàn)方法,進(jìn)行了相關(guān)實(shí)驗(yàn)研究,研究結(jié)果表明,在爆炸動(dòng)荷載作用下,位于巷道頂端的豎直裂紋最易擴(kuò)展,拱部和底角處傾斜裂紋較易發(fā)生擴(kuò)展,巷幫處水平裂紋不易擴(kuò)展,擴(kuò)展位移分別為31mm、17mm、20mm、6mm。裂紋的擴(kuò)展位移與應(yīng)力強(qiáng)度因子值密切相關(guān),巷道頂部裂紋值相對(duì)其他三條裂紋的值最大,拱部和底角處傾斜裂紋的值次之,巷幫處水平裂紋的值最小。上述研究成果對(duì)減少爆破
3、動(dòng)載荷對(duì)圍巖的擾動(dòng)和損傷,節(jié)約圍巖的支護(hù)成本,保證安全施工和快速施工有重要的指導(dǎo)意義。關(guān)鍵詞:爆炸動(dòng)荷載;巷道圍巖;裂紋擴(kuò)展;動(dòng)焦散實(shí)驗(yàn)方法;應(yīng)力強(qiáng)度因子中圖分類號(hào):文獻(xiàn)標(biāo)識(shí)碼:DynamiccausticsmodelexperimentalstudyonthedefectsextensionofroadwaysurroundingrockwhenblastingexcavationGUODong-ming1,2,YANPeng-yang1,YANGRen-shu1,2,ZUOJian-ping1,
4、YUANBao-sen1,ZHAOWei1(1.SchoolofMechanicsandArchitectureEngineering,ChinaUniversityofMining&TechnologyBeijing,Beijing100083,China;2.StateKeyLaboratoryforGeomechanicsandDeepUndergroundEngineering,Beijing100083,China)Abstract:Inordertoanalyzethedisturban
5、ceinfluenceofblastingdynamicloadonroadwaysurroundingrockdefectsindifferentlocation,theblast-loadingsystembasedondynamicreflectedcausticswasusedtoconducttherelatedexperimentalstudy.Theresearchresultsshowthatundertheexplosiondynamicloadtheverticalcrackat
6、thetopoftheroadwayismoreeasytoextendthanothers,thenaretheinclinedcracksatthearchandthecorner,andthelastarethehorizontalcrackswiththedataofcrackspropagationlength31mm、17mm、20mmand6mmrespectively.Thevalueofthedisplacementofcrackpropagationhasadirectrelat
7、ionshipwiththevalueofthestressintensityfactor,andthevalueofthestressintensityfactoroftheverticalcrackatthetopoftheroadwayisgreaterthanthatofotherthreecracks,thenisthevalueoftheinclinedcracksatthearchandcornerandthatvalueofthethehorizontalcrackhasaminim
8、umlevel.Theaboveresearchresultshavetheconductiveconsequenceonreducingthedisturbanceanddamageoftheblastingdynamicloadonsurroundingrock,savingthecostofsurroundingrocksupporting,ensuringconstructionsafelyandrapidly.Keywords:theblastingdyna